The Washington Examiner's Emily Babay reports:
An Arlington man is accused of threatening to set off bombs around D.C., including in the Metro system, but was caught through messages he sent on Facebook before a plot was developed.
Awais Younis, who also goes by Sundullah "Sunny" Ghilzai as well as Mohhanmed Khan, was charged in federal court in Alexandria with making threatening communications.
Younis, who was born in Afghanistan, used Facebook to threaten to set off explosives, according to an affidavit for his arrest by Joseph Lesinski, a special agent with the FBI's Joint Terrorism Task Force.
Authorities were tipped off to Younis by an unidentified person who corresponded with him on the social networking site, court documents say.
The documents say Younis described how to build a pipe bomb and advocated placing bombs on the third and fifth cars of Metro trains because they "had the highest number of commuters on them and he could place pipe bombs in these locations and would not be noticed."
In October, another man in Virginia named Farooque Ahmed was arrested for arrested for taking surveillance films of the Metro to prepare for an attack. Both plots appear to have been fairly unsophisticated and undeveloped.